{ config, pkgs, ... }:

{
  imports = [ 
    ./caesium.hardware.nix # Crucial: Imports your UUIDs
  ];

  time.timeZone = "America/New_York";
  nixpkgs.config.allowUnfree = true;
  nix.settings.experimental-features = [ "nix-command" "flakes" ];

  # --- BOOTLOADER ---
  boot.loader.systemd-boot.enable = true;
  boot.loader.efi.canTouchEfiVariables = true;
  boot.kernelParams = [ "usbcore.autosuspend=-1" ];

  networking.hostName = "caesium";
  networking.networkmanager.enable = true;
  networking.interfaces.enp13s0.wakeOnLan.enable = true;

  # --- STORAGE & SSD OPTIMIZATION ---
  # Enable TRIM for SSD longevity
  services.fstrim.enable = true;
  # Hard links duplicate files in the store to save space
  nix.settings.auto-optimise-store = true;

  # --- SWAP STRATEGY ---
  systemd.targets.hibernate.enable = false;
  systemd.targets.hybrid-sleep.enable = false;
  # Primary Swap: Compressed RAM (Fastest)
  zramSwap.enable = true;
  zramSwap.memoryPercent = 25;

  # Secondary Swap: 16GB File on Alpha (Safety Net)
  swapDevices = [ {
    device = "/var/lib/swapfile";
    size = 16 * 1024; # 16GB
  } ];

  # --- USER & GROUPS ---
  users.groups.storage = {};
  users.users.mbessette = {
    isNormalUser = true;
    shell = pkgs.zsh;
    extraGroups = [ "wheel" "networkmanager" "storage" "docker" ];
  };

  # --- FILE SYSTEMS (Overrides/Additions) ---
  # Note: The UUIDs stay in hardware-configuration.nix. 
  # We only list them here if we want to add specific options like compression.
  
  fileSystems."/nix".options = [ "subvol=@nix" "compress=zstd" "noatime" ];
  fileSystems."/mnt/bottles" = {
    device = "/dev/disk/by-uuid/9523b80b-8a1f-4784-9750-9b8fadf91b92"; # Use the same Alpha UUID
    fsType = "btrfs";
    options = [ "subvol=@bottles" "compress=zstd" "noatime" ];
  };

  fileSystems."/mnt/steam-games" = {
    device = "/dev/disk/by-uuid/9523b80b-8a1f-4784-9750-9b8fadf91b92";
    fsType = "btrfs";
    options = [ "subvol=@steam" "compress=zstd" "noatime" ];
  };

  fileSystems."/mnt/Projects" = {
    device = "/dev/disk/by-uuid/bd31dc44-4bc0-4080-95c7-faee9ebc2b79";
    fsType = "ext4";
  };

  # --- SYSTEM PERMISSIONS ---
  systemd.tmpfiles.rules = [
    "d /mnt                       0775 mbessette storage -"
    "d /mnt/steam-games           0775 mbessette storage -"
    "d /mnt/bottles               0775 mbessette storage -"
    "d /mnt/Projects              0775 mbessette storage -"
    "d /mnt/Projects/.docker-data 0770 root         root -"
  ];

  # --- VIRTUALIZATION ---
  virtualisation.docker.enable = true;
  virtualisation.docker.daemon.settings = {
    data-root = "/mnt/Projects/.docker-data";
  };

  # --- AUDIO ---
  security.rtkit.enable = true;
  services.pipewire = {
    enable = true;
    alsa.enable = true;
    alsa.support32Bit = true;
    pulse.enable = true;
    
    # Use pulse.rules to target specific apps or set global pulse defaults
    extraConfig.pipewire-pulse."92-discord-fix" = {
      "pulse.rules" = [
        {
          matches = [ { "application.name" = "~Discord*"; } ];
          actions = {
            update-props = {
              "pulse.min.req"     = "1024/48000";
              "pulse.default.req" = "1024/48000";
              "pulse.max.req"     = "2048/48000";
              "pulse.min.quantum" = "1024/48000";
            };
          };
        }
      ];
    };
  };

  # --- OS ---
  # This stays 'true' to enable the graphical pipeline
  services.xserver.enable = true;
  services.xserver.videoDrivers = [ "amdgpu" ];
  services.flatpak.enable = true;

  # SDDM is the login manager; Plasma 6 is the desktop
  services.displayManager.sddm.enable = true;
  services.desktopManager.plasma6.enable = true;

  # Tell SDDM to use Wayland for the login screen itself (Ultra Modern)
  services.displayManager.sddm.wayland.enable = true;

  fonts.packages = with pkgs; [
    noto-fonts
    noto-fonts-cjk-sans
    noto-fonts-color-emoji
    liberation_ttf
    fira-code
    fira-code-symbols
    mplus-outline-fonts.githubRelease
    dina-font
    proggyfonts
  ];

  # Ensure hardware acceleration is ready for Wayland
  hardware.graphics = {
    enable = true;
    enable32Bit = true; # CRITICAL for Steam/Gaming
  };

  # --- PROGRAMS ---
  programs.zsh.enable = true;
  programs.steam = {
    enable = true;
    remotePlay.openFirewall = true;
    extraPackages = with pkgs; [
      gperftools
    ];
    package = pkgs.steam.override {
      extraBwrapArgs = [
        "--bind /mnt/steam-games /mnt/steam-games"
      ];
    };
  };

  programs._1password-gui = {
    enable = true;
    polkitPolicyOwners = [ "mbessette" ];
  };

  # Biome config
  environment.etc."biome.json".source = ./config.biome.json;
  environment.etc."oxlintrc.json".source = ./config.oxlintrc.json;

  environment.systemPackages = with pkgs; [
    ethtool
    vim 
    git
    wget
    curl
    firefox
    discord
    wowup-cf
    spotify
    faugus-launcher
    signal-desktop
  ];

  services.flatpak.packages = [
    # "io.github.Faugus.faugus-launcher"
  ];

  services.flatpak.overrides = {
    # "io.github.Faugus.faugus-launcher".Context.filesystems = [
    #   "/mtn/bottles"
    # ];
  };

  programs.appimage = {
    enable = true;
    binfmt = true;
  };

  # --- SYSTEM VERSION ---
  system.stateVersion = "24.11"; # Or current stable version
}